According to the standard notation for inverse functions (f-1),
you will also often see these written as sin-1, cos-1,
tan-1 arccsc-1, arcsec-1, and arccot-1.
Beware, though, there is another common notation that
writes the square of the trig functions, such as (sin(x))2
as sin2(x). This can be confusing, for you then might
then be lead to think that sin-1(x) = (sin(x))-1,
which is not true. The negative one superscript here is a special
notation that denotes inverse functions (not multiplicative inverses).